Abdelkarim M. Ertiame and D. W. Yu and D. L. Yu and J. B. GommDynamic Fault Diagnosis for SemiBatch Reactor under ClosedLoop Control via Independent Radial Basis Function Neural Network1402 - 14132015912International Journal of Electronics and Communication Engineeringhttps://publications.waset.org/pdf/10003066https://publications.waset.org/vol/108World Academy of Science, Engineering and TechnologyIn this paper, a robust fault detection and isolation
(FDI) scheme is developed to monitor a multivariable nonlinear
chemical process called the ChyllaHaase polymerization reactor,
when it is under the cascade PI control. The scheme employs a radial
basis function neural network (RBFNN) in an independent mode to
model the process dynamics, and using the weighted sumsquared
prediction error as the residual. The Recursive Orthogonal Least
Squares algorithm (ROLS) is employed to train the model to
overcome the training difficulty of the independent mode of the
network. Then, another RBFNN is used as a fault classifier to isolate
faults from different features involved in the residual vector. Several
actuator and sensor faults are simulated in a nonlinear simulation of
the reactor in Simulink. The scheme is used to detect and isolate the
faults online. The simulation results show the effectiveness of the
scheme even the process is subjected to disturbances and
uncertainties including significant changes in the monomer feed rate,
fouling factor, impurity factor, ambient temperature, and
measurement noise. The simulation results are presented to illustrate
the effectiveness and robustness of the proposed method.International Science Index 108, 2015